Hyperloop Transportation Technologies says it will build the supersonic transport system in the southeastern city of Tongren

SHANGHAI—A Southern California technology company has clinched a deal to build China’s first hyperloop, a ground-transport system that can potentially achieve supersonic speeds.

Hyperloop Transportation Technologies of Los Angeles said Thursday that it would build the hyperloop in the Guizhou province city of Tongren, in the country’s southeast. The first six-mile phase will link the city with its airport, and a second will continue 31 miles to Mount Fanjing, a local beauty spot recently added to Unesco’s World Natural Heritage...